Hello, Elle!
There are a lot of articles on the Internet about Captcha.
Many saying it does not work on Chrome, but.....!
I found another article stating that it works perfectly on Chrome.
Apparently the "spambot" places the "tick" exactly in the middle of the box, whereas a human places the tick anywhere in the box.
So a perfectly central tick from a spambot will be rejected by Captcha/Chrome.
Now to put Sean's performance on the Law in perspective.
I remember back in the Eighties, the Kellogg's Tour of Britain came to Dundee, with a hilly prologue from the city centre to the top of the Law. (It is a brute of a climb!)
The prologue was won by Malcolm Elliott, who collapsed at the finish, and was given oxygen to aid recovery.
Sean's was an astonishing ride!
I think he is doing physics at Uni.